If a grounding-type receptacle is being supplied by a 30-ampere device, what is the minimum size for the bonding jumper?

The correct answer is based on the requirements set forth by the National Electrical Code (NEC) regarding bonding conductors. For a grounding-type receptacle supplied by a 30-ampere circuit, the bonding jumper must be sized correctly to ensure safe operation and fault current capability.

According to NEC regulations, the minimum size for a bonding jumper connecting the grounding electrode system to the equipment grounding conductor must comply with the appropriate ampacity tables. For a circuit rated at 30 amperes, the bonding jumper must be a minimum of 10 AWG copper. This size provides adequate conductivity to safely handle potential fault currents without overheating or creating a fire hazard.

Using a bonding jumper that is too small could compromise the safety measures in place, potentially leading to dangerous situations where fault currents cannot be effectively dissipated into the ground. Thus, the selection of 10 AWG copper as the minimum size demonstrates adherence to safety standards and practices in electrical installations.